Bobbin selector device

ABSTRACT

A bobbin selector device having a mechanism for detecting a bobbin not fully stripped of its yarn and for automatically removing an incompletely stripped bobbin.

[ 5] Mar. 7, 1972 United States Patent Powell 3,313,409 4/1967 1,599,806 9/1926 Brown et 2,158,069 5/1939 Grover...

[22] Filed: May 4, 1970 Primary Examiner-Allen N. Knowles Attorney-John R. Bronaugh, E. Dennis OConnor and Floyd S. Levison [211 Appl. No.:

[57] ABSTRACT A bobbin selector device having a mechanism for detecting a bobbin not fully stripped of its yarn and for automatically removing an incompletely stripped bobbin.

hm m U [52] U.S.Cl.....

References Cited UNlTED STATES PATENTS iSelwood et HM-1 .0 199 X PATENTEDHAR 7 m2 3, 647, 065

SHEET 2 OF 4 BOBBIN- SELECTOR nsvrcs BACKGROUND OF THE INVENTION The invention is applicable to a bobbin-loading apparatus such as shown and described in U.S.' Pat. No. 3,290,857 whereby empty filling bobbins are guided into magazines by a means which controls the quantity and relative position of the bobbins therein. As is well known to those conversant in the art, these magazines are utilized to feed empty bobbins to a combined donning and doffing apparatus which impales the bobbins on spindles of a spinning frame and for a detailed description of such a mechanism'attention is directed to US. Pat. No. 2,961,822.

A well-known practice in preparing a'filling bobbin for the building of a new filling-package thereon is that of stripping the few remaining winds of yam remaining 'on the 'barrel thereof which are normally present after its ejection'from a loom shuttle. These few remaining winds of yarn or so-called feeler bunches which remain on bobbins are removed :by a stripping-machine and thebobbins are received by-the loading apparatus in large quantities and in noparticular arrangement. The bobbins must then "be oriented 'and separated into predetermined quantities so as to properlyfill thezinternalsections of the magazines.

ln theevent a bobbin fails to be stripped of "its .yam and passes through the various steps of 1 its preparation and'isrimpaled upon a spindle of a spinning frame it'becomes necessary that an operator take the'time to manually remove 'such'abobbin and replace it with an appropriate one. The'primarypurpose for replacing such a bobbin is that of preventing a second feeler bunch from being formed whereby the looms-filling -'feeler would fail to perform its intended function resulting in a complete runout of the filling yarn.

The bobbin selector device-according to the inventionprovides a-means for detecting a' bobbin not completely-stripped of its filling yarn as well as a means deriving an indication-from the detecting means for segregating. such a bobbin thereby eliminating the posibility ofits being loaded into-av magazine and the subsequent donning thereof onto thespindle of a spinning frame.

SUMMARY OFTHE'INVENTION When the bobbins arrive 'at the first positiona'filling feeler of the side slipping type is'moved into position to sense'the presence or absence of yarn on a bobbin. If no yarn is on a bobbin it is advanced to the second position and thence returned to the track elements where it continues on to be loaded into a magazine. Should yarn be detected on a bobbin, T

the feeler will not slip and is effective in activatingaswitch which completes circuitry to a solenoid mechanically linked to a plunger member. This plungermember is timed to be activated when a detected bobbin is'moved by the indexing turret to its second position where it is then ejected'by said" plunger member.

Additionally the device includes sensing *means of the photoelectric type which are disposed so as to effect cessation of the mechanism when the number of bobbins' within the track elements fall below a predetermined amount and to automatically restart said mechanism'when the buildup of bobbins reaches a predetermined number.

It is a general object of the invention to provide'a selector device for detecting a' bobbinnot'completely stripped of its filling yarn and for automatically removing such a bobbin.

":positionedinterrnediate thev ends ofthe track members 10 and A more specific object of the invention is to provide a selector device that will detect and eliminate a bobbin not stripped of its yam.

BRIEF DESCRIPTION .OF THE DRAWING I FIG. 1 is a perspective view-of aportion of a'bobbin-loading apparatusshowingthe bobbinselectordevice according to the invention applied thereto and the position the filling feeler is caused to assume when making contact with a stripped bobbin.

FIG. 2 isaportion of the viewshown in FIG. 1 but with the filling. feeler -in that position for detecting a bobbin not stripped of its filling yarn.

FIG. 3 is aperspeetive -view.sirnilar to FIG. I butas seen looking from the opposite side thereof.

FIG. 4 is a'plan view of the plunger member for ejecting a detectedbobbin.

FIG. 5 is .-a wiew inside elevation of the plunger member shown in FIG. 4.

FIG. 6 is a .view'asseen looking from the underside of the bobbin selector device showing the source of power and means foerotating the-indexing turret.

FIG. 7 is a view inside-elevation .and'partially in section .takenalongline 7-7 in FIG. 6 .and'FIG. 8 is a wiring diagram of-theelectricalcircuit'employed forinitiating actuation ofthe plungermember as .well as for automatically stopping and restartingathe-bobbinselector device.

DESCRIPTION-OF THEPREFERREDEMBQDIMENT As the generalrconstruction and operation of-a bobbin-loadingaapparatus is wellaknown and familiar to .those conversant in the "art, andas the invention is entirely concerned with a bobbin selector device applicable thereto, it is onlyconsidered -.necessary here toillustrate anddescribe those parts of such an apparatusdirectlyconcerned with a preferred form of the :present invention.

. In-"FIGS. land} there is shown a pair of'spaced track members lo and ll whichextend in parallel relation ,and are inclined -toward;the front of the loading apparatus (not shown).

The .bobbins are supported by the shoulder of their butt portionsforsliding movement in the space intermediate the track as nylon .andserves to facilitate the downward sliding movement of thebobbins (FIGSJ and3).

flhexbobbinselector deviceaccording to the invention is identified-generally in'FlGSr l,.2 and 3 by numeral 14 and is 11 inihe.areabetween.the hopperarrangement and the meteringdevice.

'Thelowerportion of .thetbobbintselector device is-supconfiguratiomil'he various components adapted toengage and act upon: the bobbins l2iare. disposed in the area intermediate -.the baseplate l5 and top plate l6.and includesan indexing turf ls-dispose'dabout the periphery;thereof(FlGS.1 and 3).

ret liofirconicalshape with. spacedbobbin receiving pockets .TheS-indexingturret I7 is;positioned adjacent to the base -plate l5 .andis-fixed on a shaft 19 the axis of which-extends in I a plane :normalto the path thewbobbins 12 are caused to follow I journaledinabearing 20 whichis assembled to the top, plate 1 why means of three equally. spaced serews'2l..- As is shown in FIG. 7, shaft 19 adjacent its-lower end is joumaled-in abearing "22 which is fixed to the base;plate 15 by anysuitablemeans 'in the track members I0 and 11. The upper end of shafl 19 is (not shown). Extending throughand beyond the lower surface of baseplate l5, shaft 19 is provided adjacent its lower end with a star wheel 23 that fomts a part of a geneva motion for rotating the indexing turret l7 and will be more fully described hereinafter.

In the area intermediate the indexing turret 17 and the underside of the top plate 16, shaft 19 has fixed thereon a disc member 24 having bobbin-butt-supporting recesses 25 disposed about the periphery thereof which are in alignment with the pockets 18 in the indexing turret 17. This indexing turret and disc member 24 are rotated in unison by shaft 19in the direction of the indicating arrow 26 (FIGS. 1 and 3) and are effective in moving each bobbin to a first position where it is presented to a means to be described which senses the presence or absence of filling yarn thereon. From the first position the bobbins are advanced to a second position and a bobbin having yarn thereon detected in the first position is automatically ejected, by a means to be described on its arrival at said second position. A means is provided for retaining the bobbins within the confines of the indexing turret and disc member 24 as the bobbins are moved from the track members and 11 and comprises arcuated shield elements assembled in close proximity with said turret and disc. The lower shield element is identified by numeral 27 and, by means of integrally formed ears 28, isattached to the baseplate by screws 29 to partially enclose the lower portion of the indexing turret 17.

The upper shield element 30 is disposed in close proximity with the disc member 24 and, by means of a screw 31, is attached to the side of a U-shaped support bracket 32. Support bracket 32 is attached to the underside of the top plate 16 by a screw 33 and the depending legs of said bracket assist in supporting and positioning of the track members 10 and 11 (FIGS. 1 and 3). As shown in FIG. 1 shield elements 27 and 30 are provided respectively with recesses 34 and 35. Recesses 34 and 35 are in alignment one with each other (FIG. 1) to provide an opening through which a bobbin may be radially ejected if detected to have filling yarn thereon by the feeler device now to be described.

Although the feeler device shown and described in of the well-known side slipping type such as shown in U.S. Pat. Nos. I,593,426, 1,599,806 and others, it should be understood that various forms of feelers such for example as photoelectric could readily be adapted to perform this function.

The feeler device, identified generally in FIGS. 1 and 2 by numeral 36, includes a casing 37 from which extends a feeler blade or so-called filling feeler 38. As is known, a spring-biasing mechanism (not shown) carried within the casing 37 continually urges the filling feeler 38 axially outwardly fromsaid casing in a generally horizontal plane. The end of the filling feeler 38 is adapted as by a spring 39 for pivotal movement upon sliding contact with a fully stripped bobbin but for axial movement upon contact with a partially stripped bobbin. Compare FIGS. 1 and 2 for example. Spring 39 is only one of many end adaptations of feeler 38 which may be utilized for this purpose. The opposite end of the filling feeler terminates in an offset portion 40 (FIG. 2) and also extends outwardly from casing 37 as at 41 in FIGS. 1 and 2 and serves to trigger the means for initiating ejection of a detected bobbin.

The casing 37 is carried on a bar element 42 (FIGS. 1 and 2) which is assembled for sliding movement in a guide block 43. This guide block 43 is fixed to a support stand 44 the lower end of which is attached to the baseplate 15 by screws 45 and the upper end of which is attached to the underside of the top plate 16 by screws 46.

As shown in FIGS. 1 and 2 the bar element 42 extends outwardly from the guide block 43. The end of bar 42 most remote from block 43 is bifurcated to support a cam follower roller 47 on a stud 48. The cam follower 47 is continually urged into contact with a feeler cam 49 by a spring-biasing means (not shown) which is contained within the guide block 43 and arranged to act upon the bar'element 42.

The feeler cam 49 is fixed to cam shaft 50 for rotation therewith. Cam shaft 50 is joumaled adjacent its upper end in a bearing 51 mounted on top plate 16 by screws 52. The upper end of the cam shaft extending beyond said bearing member 51 has a knob 53 fixed thereon to permit manual rotation of the shaft 50. The cam shaft 50 adjacent its lower end is joumaled in a bearing 54 mounted on the base plate 15 by means of screws 55 (FIG. 1). Axial movement of the cam shaft 50 is prevented by collars 56 fixed thereon (one only shown in FIG. 1) in positions intermediate but immediately adjacent to the bearings 51 and 54 in which shaft 50 is journaled.

As is shown in FIGS. 6 and 7, that portion of cam shaft 50 extending below the baseplate 15 is interconnected with the source of power for operating the bobbin selector device. A. pulley member 57 is rotatably carried on the lower end of cam shaft 50 and, by means of an endless belt 58, this pulley is interconnected with a motor pulley 59 that is assembled on the output shaft 60 of a drive motor 61 (FIG. 6). A friction-type slip clutch, generally indicated by numeral 62 (FIG. 6), is positioned above the pulley 58 on cam shaft 50 and permits slippage of the driving mechanism in the event a bobbin should jam or otherwise malfunction in the operation of the bobbin selector device. The lower plate 63 of the clutch 62 is fixed to rotate with the pulley member 57. The upper plate 64 of the clutch 62 is fixed to the cam shaft 50. Suitable clutch friction material (not shown) is attached to the upper face of the clutch plate 63 and is in frictional contact with the lower face of plate 64 and thus provides the necessary means for rotating cam shaft 50 in the direction of the indicating arrow 65 in FIG. 6.

A sprocket 66 (FIGS. 6 and 7) is fixed on the cam shaft 50 intermediate the underside of the base plate 15 and upper clutch plate 64. An endless sprocket chain 67 interconnects sprocket 66 with a sprocket 69 which forms an integral part of a turret drive wheel 70. This turret drive wheel 70 is rotatably mounted on a stud 71 that depends from the baseplate l5 and is attached to the latter by means of a nut 72. The turret drive wheel 70 further includes a flange 73 extending about its circumferential extent with an upwardly projecting drive roll stud 74 (FIGS. 6 and 7) assembled thereon. This drive roll stud 74 is caused to travel in a circular path as the turret drive wheel is rotated and is positioned so that it sequentially enters slots 75 in said wheel thus intermittently rotating the latter in increments in the direction of the indicating arrow 76 shown in FIG. 6. To maintainthe endless sprocket chain 67 under the desired amount of tension during operation and to facilitate its assembly and removal, an adjustable idler sprocket 77 is provided which is rotatably assembled on a stud member 78. Stud member 78 (FIGS. 6 and 7) depends from the base plate 15 and is attached to the latter by means of a nut 79.

The turning of the star wheel in increments as described rotates shaft 19 and the indexing turret 17 carried thereby in a like manner to effect receiving each bobbin individually into the pockets 18 of said turret. As the indexing turret is rotated each bobbin is carried from the track members 10 and 11 to a first position where it is subjected to the means for sensing the presence or absence of filling yarn thereon, thence to a second position where it is ejected should filling yarn be detected in the first position and on the next movement of the turret a bobbin free of filling is returned to the track members where it is guided to that position (not shown) for loading into a magazine.

The feeler cam 49 is timed to move or slide the feeler device 36 in the direction of a bobbin when it is carried to the first position by the indexing turret 17. This movement causes the end 39 of the filling feeler 38 to contact the bobbin 12 and, if no filling yarn is present on said bobbin, said filling feeler is caused to pivot downwardly as shown in FIG. 1.

The presence of filling yarn on a bobbin will not permit the filling feeler to pivot. This is shown in Flg. 2. In this event, the filling feeler 38 remains stationary and movement of the casing 37 toward the bobbin causes the offset portion 40 of the filling feeler 38 to contact and actuate a feeler switch 80 that is carried on bar element 42. This switch 80 attaches to a support bracket 81 which depends from bar element 42 and is attached to the latter by means of screws 82. The switch also includes an actuating lever 83 which extends to a position where the end thereof is caused to contact the offset portion 40 of the filling feeler 38 when the latter is prevented from slipping downwardly due to the presence of filling yarn on a bobbin. When the filling feeler 38 is pivoted downwardly as shown in FIG. 1 the offset portion 40 thereof moves upwardly to avoid contact with the actuating lever 83 of the switch 80.

A timer switch 84 is carried on a support bracket 85 (FIG. 1) that is attached by any suitable means to the lower portion of the support stand 44 as at 86. This switch 84 includes an actuating arm 87 which is in continual contact with the outer periphery of a timing cam 88 that is fixed on and caused to rotate with the cam shaft 50. Switches 80 and 84 as shown in FIG. 8 are to control a solenoid 89 which, as shown in FIG. 3, is attached to the underside of the top plate 16. The plunger 90 element of solenoid 89 is pivotably connected at 92 to one end of a lever 91. Lever 91 is pivotably supported intermediate its ends on a stud (not shown) attached to and depending from the underside of the top plate 16.

The opposite end of lever 91 is pivotably connected to an ejector rod 93 as at 94. Ejector rod 93 is supported and guided adjacent its opposite end in a bearing 95 carried in a support bracket 96, the latter of which is positioned in close proximity to shaft 19 and is attached to the underside of the top plate 16 by screws 97 (FIGS. 3, 4 and 5). The free end of the ejector rod 93 has an arcuated shoe 98 fixed thereon which upon actuation of said rod engages the butt of .a detected incompletely stripped bobbin and ejects it from the indexing turret 17. A coil spring 99 on rod 93 intermediate bearing 95 and a collar 100 fixed to rod 93 biases rod 93 toward its retracted position shown in FIGS. 3, 4 and 5.

To energize the solenoid 89, both switches 80 and 84 must be actuated. When the filing feeler 38 detects yarn on a bobbin in the first position, the opposite offset end 40 acts upon lever 83 to actuate switch 80. As will be explained presently, switch 80 actuates a relay 135 which is held on through its hold contacts 136 and which closes its contacts 137 until switch 84 is actuated by the timing cam 88 to complete the circuitry to energize the solenoid 89. This time delay in the switching is necessary to permit the indexing turret 17 to carry a detected bobbin to the second position where it will be ejected. When the solenoid 89 is energized, its plunger 90 is drawn inwardly causing the lever 91 to pivot in a clockwise direction as viewed in FIG. 3. This motion causes the ejector rod 93 to move in the direction of the arrow 101 shown in FIGS. 3, 4 and 5 and the detected bobbin is ejected from the indexing turret 17.

A solenoid switch 102 in circuit with switches 80 and 84 is assembled to the top plate 16 by means of a support bracket 103 and is disposed so that its actuating element 104 (FIG. 3) is in contact with the upper surface of thedouble armed lever 91. This double-armed lever is in a position at the end of the ejection stroke of the ejector rod 93 which permits the actuating element 104 of the solenoid switch 102 to leave the upper surface of the double-armed lever 91 thus opening this switch which is effective in returning switches 80 and 84 to their initial state in readiness to repeat the cycle should filling yarn be detected on the following bobbin.

That portion of the track members and 11 which guide the bobbins to the indexing turret 17 is provided with a pair of I spaced bobbin-sensing devices. The first of these devices causes a cessation of the bobbin selector device should the bobbins within this portion of the track members be reduced in number below a predetermined amount. The second bobbin-sensing device permits the bobbin selected device to start automatically when the number of bobbins carried by the track members builds up to a predetermined amount. Both the first and second bobbin-sensing devices are similar in appearance and form a part of the electrical circuitry of the bobbin selector device which will be more fully described hereinafter.

The first bobbin-sensing includes a light source 105 and is attached to the outer side of track'member 10 by means of a support bracket 106 (FIG. 1). This light source directs a light beam through openings 107 and 108 provided in track members 10 and 11 respectively and is received by a photoelectric cell 109 (FIG. 3) which is carried on the outerside of track member 11 by a support bracket 110.

The second bobbin-sensing device also includes a light source llland'is attached to the outer side of track member 10 by means of a support bracket 112 (FIGS. 1 and 3). This light source directs a light beam through openings 113 and 114 provided in track'members 10 and 11 respectively and is received by a photoelectric cell 115 (FIG. 3) which is carried on the outerside of track member 11 by a support bracket 116.

The operation of the bobbin selector device is controlled electrically as shown in diagram form in FIG. 8.

A disconnect switch 117, connected to a suitable threephase source (not shown), when closed provides 110 volts at the secondary side of transformer 118 to energize lamps 105 and 111. Manual actuation of start switch 119 energizes a control relay 120 to close its hold contacts 121 and is effective in latching said control'relay 120 on through a stop/reset switch 122, contacts 121 and a'second set of control relay contacts 123 thus completing the circuit to a telltale light 124 which indicates the bobbin selector device is in readiness to commence operating. At this time no further circuit action will occur until the track members 10 and 11 have received a predetermined number of bobbins 12. AS the bobbins are presented to the bobbin selector device they move by gravitational force down the incline of track members 10 and 11 and stop when reaching the indexing turret 17 which as yet is not being rotated. When the bobbins are stopped in this manner the number thereof within the track members increases progressively. The initial buildup of bobbins interrupts the light beam extending between the light source 105 and the photoelectric cell 109 actuating photoelectric relay 125 to close its contacts 126.

As the bobbins continue to be fed to the track members the light beam between the light source 111 and the photoelectric cell 115 which form a part of a photocontrol relay 127 is momentarily interrupted; however, the circuit does not respond due to a time delay capacitor 127' which forms part of said photocontrol relay 127. When a bobbin remains stationary in this light beam due to the track members receiving their full complement, the contacts 128 of the photocontrol relay 127 close and energize a motor control relay 129. Three-phase power is applied to the drive motor 61 through contacts 130, 131 and 132 of relay 129. An auxiliary contact 133 of the motor control relay 129 is utilized to latch the motor control relay 129 on until its circuit is interrupted by opening of contacts 128, switch 122 or contacts 123.

The auxiliary contact 133 also applies 1l0-volt power to a time delay relay 134 the purpose of which will be described hereinafter.

When the track members 10 and 11 are fully loaded, the drive motor61 is actuated and, as previously described, it is effective to rotate the'indexing turret 17 which receives each bobbin individually, carries it successively to a first position for sensing the presence or absence of filling yarn thereon, to a second position and, if no filling yam was detected in the first position, then returned to-the track members 10 and 1 1 where it 1 advances by gravity to a position for loading into a magan'ne. If filling yarn is detected ona bobbin when it is in the first position, the feeler switch 80 is closed and energizes control relay 135 to close two sets of contacts 136 and 137. Contacts 136 latches the control relay on, and the set of contacts 137 is wired in series with the timer switch 84. The timer switch closes when the indexing turret moves the detected bobbin to the second position or in other words that position proper for its ejection. With the timer switch-84 activated and the control relay 135 energized power is then applied to the solenoid 89' and the actuation thereof causes the doublearmed lever linked thereto to act upon the ejector rod 93 so as to eject the detected bobbin.

When the plunger element 90 of the solenoid 89 reaches the end of its actuation stroke, the actuating element 104 of the solenoid switch 102 loses contact with the double-armed lever 91 ad is opened causing the control relay 135 to be deenergized thus returning the circuitry to its initial state and in readiness to permit actuation of the feeler device 36 on the following bobbin.

Should the supply of bobbins in the track members 10 and 11 diminish to the extent where the light beam extending between the light source 105 and the photoelectric cell 109 is no longer interrupted, contacts 128 will open causing the control relay 129 to deenergize which will interrupt the power to the drive motor 16.

As heretofore described the bobbin selector device utilizes a slip clutch arrangement 62 and should a bobbin become jammed in the indexing turret, shaft 19 will cease to turn thus preventing any damage from occuring.

This means for causing a cessation of the bobbin selector device is accomplished in the following manner. The timing switch 84 that energizes the solenoid 89 is also in circuit with the time delay relay 134. As the cam shaft 50 rotates, the timer switch 84 keeps cycling, in other words it is continually being turned on and thence off and each time it cycles it resets the time delay relay 134. When the clutch is caused to slip due to a bobbin jam or other malfunction of the device, the cam shaft 50 ceases to rotate and will not permit the timer switch 84 to cycle and reset the time delay relay 134. This results in the energizing of the time delay relay 134 and the closing of contacts 138 which then energizes a control relay 139.

The control relay is latched on by contacts 140 at which time contacts 123 are opened resulting in the deenergizing of the control relay 120.

With the deenergizing of the control relay 120, the driving mechanism for the bobbin selector device is stopped and a telltale light 141 goes on to indicate a shutdown of the unit.

Upon correction of the bobbin jam or other malfunction, the stop-reset switch 122 must be actuated to deenergize the control relay 139. With the deenergizing of the control relay 139, the circuitry is reset and can be started again in the normal manner.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A bobbin selector device comprising:

guide means for supporting and conveying bobbins;

means interposed between the ends of said guide means for receiving and advancing each bobbin individually to a first and second position removed from said guide means;

feeler means including a feeler blade for contacting each bobbin at the first position and sensing between bobbins which are completely and bobbins which are incompletely stripped of yarn;

means at said second position for ejecting incompletely stripped bobbins from said receiving and advancing means; and

a first switch adapted to be closed by said feeler means when said feeler blade senses an incompletely stripped bobbin and a second switch connected in series with said first switch whereby said first and second switches must be closed before said ejection means can be operated.

2. The bobbin selector device according to claim 1 wherein said second switch is periodically closed by a timing cam.

3. The bobbin selector device according to claim 1 wherein said ejecting means includes a solenoid in circuit with said first and second switches and an ejector rod member operably connected to said solenoid and activated upon the energizing of the latter to eject an incompletely stripped bobbin from said receiving and advancing means. 

1. A bobbin selector device comprising: guide means for supporting and conveying bobbins; means interposed between the ends of said guide means for receiving and advancing each bobbin individually to a first and second position removed from said guide means; feeler means including a feeler blade for contacting each bobbin at the first position and sensing between bobbins which are completely and bobbins which are incompletely stripped of yarn; means at said second position for ejecting incompletely stripped bobbins from said receiving and advancing means; and a first switch adapted to be closed by said feeler means when said feeler blade senses an incompletely stripped bobbin and a second switch connected in series with said first switch whereby said first and second switches must be closed before said ejection means can be operated.
 2. The bobbin selector device according to claim 1 wherein said second switch is periodically closed by a timing cam.
 3. The bobbin selector device according to claim 1 wherein said ejecting means includes a solenoid in circuit with said first and second switches and an ejector rod member operably connected to said solenoid and activated upon the energizing of the latter to eject an incompletely stripped bobbin from said receiving and advancing means. 